<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->

      <div class="avatar_box">
        <img src="../assets/logo.png" />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        ref="loginFormRef"
        label-width="0"
        class="login_form"
        :model="loginForm"
        :rules="loginFormRules"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="iconfont icon-user"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            prefix-icon="iconfont icon-3702mima"
            v-model="loginForm.password"
            prop="password"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button
            type="primary"
            @click="login"
          >登录</el-button>
          <el-button
            type="info"
            @click="resetLoginForm"
          >重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      loginForm: {
        //登录表单数据绑定对象
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        //表单验证规则对象
        username: [
          //验证用户名是否合法
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          //验证密码是否合法
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    //点击重置按钮 重置登录表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功！')
        //1.将登录成功之后的 token，保存到客户端的 sessionStorage中
        //1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //1.2 token 只应在当前网站打开期间生效，所以讲token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        //2.t通过编程时导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>
<style lang="less" scope>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      padding: 10px;
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      background-color: #fff;
      transform: translate(-50%, -50%);
      img {
        height: 100%;
        width: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  box-sizing: border-box;
  width: 100%;
  padding: 0 20px;
}
</style>